| 摘要 |
PURPOSE:To reduce the overall length and reduce the size of an outer periphery by directly installing first and second bodies which form a main body to a cylinder body and forming an operating space without forming any superfluous vacant part on the outer periphery side of said cylinder body. CONSTITUTION:A poppet valve 54 for transmitting input to an input member 49 is seated on a valve seat 58, a plunger 50 and the poppet valve 54 are separated from their seats, an outer air is fed into a pressure changing chamber 38 through an inserting hole 60, a master cylinder part 2 is operated via a movable body 37 due to the pressure difference between the pressure changing chamber 38 and a negative pressure chamber 39, and pressures generated in pressure chambers 9, 10 are independently fed to a brake circuit. Due to such a structure, the master cylinder part 2 can be installed to the inside of a booster 3 so as to reduce the axial length from an installing face to body to a bolt 20. And, since a second body 34 and the movable body 37 are directly fitted on a cylinder body 4, no wasteful space is formed enabling an outer shape to be small. |
